Let's take a look at who's apostate
You should ask yourself, "Why would any man tell you that he cannot lead you astray?" as is outrageously declared in OD1.
Contact me if you need help finding the many scriptures which teach the answers to these questions.
Remember this verse from DC 93:39:
And that wicked one comes and takes away light and truth, through disobedience, from the children of men, and because of the tradition of their fathers.
"Apostasy" Defined in Section 32.6.3.2 of the handbook:
Clear and deliberate opposition to the Church
"Repeatedly acting in clear and deliberate public opposition to the Church, its doctrine, its policies, or its leaders"
Persist in teaching a false doctrine
"Persisting in teaching as Church doctrine what is not Church doctrine after being corrected by the bishop or stake president"
Weaken the faith of members
"Showing a pattern of intentionally working to weaken the faith and activity of Church members"
Continue to follow the teachings of apostate sects
"Continuing to follow the teachings of apostate sects after being corrected by the bishop or stake president"
Join another church and promote ITS teachings.
"Formally joining another church and promoting its teachings."